Audio-Technica Wireless Microphone System (M2RM) The Audio-Technica M2RL Receiver for Wireless In-Ear Monitoring System is a rugged body pack receiver that works in the Band M 614.000-647.000 MHz frequency range. It has LED indicators that provide easy-to-read level monitoring as well as a battery indicator. For your convenience, it allows you Personal Mix Control for controlling the volume and mix of two independent signals. Body-pack stereo receiver for use with Audio-Technica M2L and M2M Wireless In-ear Monitor Systems. Includes EP3 in-ear dynamic headphones, extension cable/adapter with 3.5 mm connector, interchangeable earpieces (Small, Medium & Large), ear-conforming foam tips, soft pouch. Features: High-fidelity sound with clean, articulate mix allows you to hear yourself better at lower volume 100 selectable UHF channels Up to 10 simultaneous systems per frequency band Three receiver modes: Personal Mix, stereo and mono Personal Mix Control allows volume and mix control of two independent signals at the receiver Use any number of M2R Stereo Receivers (with Personal Mix Control) on the same frequency Band M: 614.000-647.000 MHz Specifications: Operating Frequencies: Band M: 614.000-647.000 MHz, 100 frequencies Receiver: System: Double conversion super heterodyne Receiver: RF Sensitivity: 20 dBuV (at 60 dB S/N ratio, 50 ohms termination) Receiver: Headphone Output Connector: 3.5 mm TRS stereo phone jack Receiver: Headphone Output Power: 65 mW (at 32 ohms) Receiver: Antenna Input: SMA-type, 50 ohms Receiver: Aux Input Connector: 3.5 mm TRS stereo phone jack Receiver: Batteries: 2 x 1.5V AA (not included) Receiver: Battery Life: 8 hours (alkaline) Dimensions (W x D x H): Receiver: 70.0x25.0x110.0mm / 2.75x0.98x4.33" Weight: Receiver: 110g / 3.88oz (without batteries)